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| Registros recuperados: 11 | |
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| Boubacar, Inoussa. |
| A standardized precipitation index is used in a regression analysis to quantify the impact of climate change on agricultural productivity in Sahel. I first estimate a Malmquist productivity index and its efficiency and technical change components. I further assess the statistical significance of the indices by estimating some confidence intervals via a bootstrap method. In the second stage of the analysis, I use a Probit model to estimate the extent to which climate variables affect agricultural productivity. It appears that agricultural performance has been disastrous in many Sahelian countries from 1970 to 2000. Using a comparable cross-country measure of drought, I provide evidence that precipitation variability is constraining not only Sahel’s... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Productivity; Agriculture; Sahel; International Development; Production Economics; O13; O55; Q54. |
| Ano: 2010 |
URL: http://purl.umn.edu/56321 |
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| Constant, Labintan Adeniyi. |
| Nowadays climate change event and poor population vulnerability become more severe and natural resources scarcity intensity increased. In order to mitigate climate change negative effects adaptive policies such as poverty reduction Strategy and National Adaptation Plan of Action (NAPA) as effective’s responsive strategies. There are also farmers traditional adaptation methods which are consider as local mainstreaming climate change adaptation framework. This paper has explore subjective qualitative evaluation of climate change risk management framework strategic and link its with poverty reduction strategy in the Sahel .Sahel is one of the most vulnerable areas in the world with lower HDI(0.2%) and have the highest poverty rate (over 45% of the people live... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Sahel; Climate Change; Poverty Reduction; Adaptation Strategy.; Resource /Energy Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/100537 |
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| Vang Rasmussen, Laura; Department of Geography & Geology, University of Copenhagen, Denmark; lr@geo.ku.dk; Reenberg, Anette; Department of Geography & Geology, University of Copenhagen, Denmark; ar@geo.ku.dk. |
| We discuss the adaptive cycle heuristic as a potential platform for describing the functioning and directions of change in Sahelian land use systems. Specifically, the aim is to go beyond the simplified narrative of a vicious circle of land degradation and land expansion prompted by population pressure and low rainfall and to develop conceptual means to account for system recovery and adaptation to exposures. We use a village study from northern Burkina Faso as an empirical point of departure. On the basis of information obtained from extensive interviews and surveys at the group and household level, the different phases of the adaptive cycle—exploitation (r), conservation (K), release (Ω) and reorganization (α)— are... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive cycle; Connectedness; Potential; Sahel; Social-ecological systems. |
| Ano: 2012 |
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| Hein, Lars; Weikard, Hans-Peter. |
| Economic modelling of semi-arid rangelands has received much attention in recent literature. A major outstanding issue is how stochastic rainfall and the feedback effect of heavy grazing pressures on vegetation productivity can be accounted for in these models. This paper presents a model for calculating the optimal livestock stocking rate in a semi-arid rangeland that accounts for stochastic rainfall, the ecological feedback effect and variable prices. The model is developed for rangelands dominated by annual rather than perennial grasses, such as the African Sahel. The feedback effect is modeled on the basis of an ecological study, conducted in northern Senegal, that analyzes the impact of different grazing pressures on vegetation productivity. The paper... |
| Tipo: Journal Article |
Palavras-chave: Semi-arid rangelands; Optimal stocking rate; Modeling rangeland ecology; Sahel; Livestock Production/Industries; Q24; D24. |
| Ano: 2008 |
URL: http://purl.umn.edu/56959 |
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| Rives, Fanny; CIRAD, UPR GREEN, F-34398 Montpellier, France; fanny_rives@yahoo.fr; Antona, Martine; CIRAD, UPR GREEN, F-34398 Montpellier, France; martine.antona@cirad.fr; Aubert, Sigrid; CIRAD, UPR GREEN, 99 Antananarivo, Madagascar CIRAD, UPR GREEN, F-34398 Montpellier, France; sigrid.aubert@cirad.fr. |
| We explore the impact of forest policy reforms implemented in the early 1990s in Niger in the wake of the severe droughts that affected the Sahel in the 1970s and 1980s. We focus on Sahelian multiple-use forest ecosystems and set out to analyze policy-induced changes in the patterns of interactions between various uses, users, and dry-forest ecosystems, interactions that influence the effective management of rural forests. We put forward the hypothesis that the new forest policy reforms were designed according to a vulnerability diagnosis, highlighting two stressors: droughts and increased demand for firewood. This led to a single-issue policy focused on firewood provision and was implemented through the Household Energy Strategy (HES). The HES... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Ecosystem services; Fuelwood; Rural forest; Sahel; Social-ecological changes; Socio-ecological changes. |
| Ano: 2012 |
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| Igbokwe,I. O; Grema,H. A; Ikpo,A. E; Mshelbwala,F. M; Igbokwe,N. A. |
| Out of 1608 Nigerian Sahel male goats (bucks) examined for cryptorchidism in an abattoir, 9 (0.6%) had right unilateral cryptorchidism. The coat colour-specific prevalence was highest among the brown bucks (2.1%); and was 0.8%, 0.6%, and 0.3% among black, white, back-and-white bucks, respectively. The condition was not found among bucks with brown-and-black, brown-and-white, and multiple coat colours. The right and left testes of normal bucks and the descended testes of cryptorchid bucks had comparable gross testicular measurements, but the retained cryptorchid testes were smaller in size. The estimates of the testicular measurements showed that testicular weights (with the entire epididymes), peripheral longitudinal lengths and mid-circumferences of the... |
| Tipo: Journal article |
Palavras-chave: Abdominal; Cryptorchidism; Goat; Hypoplasia; Morphometry; Nigeria; Sahel; Subcutaneous; Testis; Unilateral; Degeneration; Orchitis; Fibroplasia. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300027 |
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| Registros recuperados: 11 | |
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